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Cylinder head porting — refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve the quality and quantity of the air flow. Cylinder heads, as manufactured, are usually suboptimal due to design and manufacturing… … Wikipedia

Controlled-access highway — Freeway redirects here. For other meanings, see Freeway (disambiguation). A freeway with a wide grass median (Highway 402 in Canada) A controlled access highway is a highway designed exclusively for high speed vehicular traffic, with all traffic… … Wikipedia

Diving cylinder — Diving cylinders to be filled at a diving air compressor station … Wikipedia

Key (lock) — A cut key A key is an instrument that is used to operate a lock. A typical key consists of two parts: the blade, which slides into the keyway of the lock and distinguishes between different keys, and the bow, which is left protruding so that… … Wikipedia

Electronic lock — A quick demonstration of an electronic door lock An electronic lock (more precisely an electric lock) is a locking device which operates by means of electric current. Electric locks are sometimes stand alone with an electronic control assembly… … Wikipedia

History of virtual learning environments — A virtual learning environment (VLE) is a system that creates an environment designed to facilitate teachers in the management of educational courses for their students, especially a system using computer hardware and software, which involves… … Wikipedia